The BD243A from Comset Semiconductors is a Bipolar Junction Transistor with Emitter Base Voltage 5 V, Emitter Cut off Current 1 mA, Collector Base Voltage 60 V, Collector Cut off Current 0.7 mA, Collector Emitter Breakdown Voltage 60 V. Tags: Through Hole, NPN Transistor. More details for BD243A can be seen below.